Maxwell Smart: Oh great, I have gum on the bottom of my new shoes.
Guy on the plane: Hey! He's trying to light his shoe!
Guy on the plane: It's a shoe bomb! Get HIM!
Maxwell Smart: No, it's gum.
Lady on the plane: Gun?
Lady on the plane: He's got a gun!
Maxwell Smart: No... GUUUMM!
Air Marshal: Air Marshal! You're under arrest!
Maxwell Smart: Sir, I believe you just shattered my coccyx!
Max is trying to scrape some gum off the bottom of his shoe using a match while on the plane. His actions are clearly misinterpreted.